Literally

 Ninety-nine times out of a hundred, you can remove this word, and your writing will be much cleaner and more accurate without it. Either it’s redundant, or it’s used incorrectly.

For example, “Monica literally stayed out until 3 AM.” How different is that from saying, “Monica stayed out until 3 AM”? The word literally adds nothing to the sentence. If you want to emphasize how late Monica stayed out, you could say, "Monica actually stayed out until 3 AM" or add an exclamation mark. In this context, "literally" is used correctly, but it doesn’t add anything to the prose.

However, more often than not, the term is used incorrectly. It’s one of my pet peeves and makes me want to pull all my hair out when I see a sentence written in the first person where our protagonist says, “I literally died.” Hmm, I don’t think so. Unless you’re making that statement from the Upside Down or communicating with us through a Ouija board and you are in the realm of the dead, you did not literally die because literally means actually. You could say that you virtually died, i.e., it felt like it. That would be good. Not good for you, but it’s grammatically correct.

So, be on the lookout for the term “literally” in your writing. If it’s your vocabulary, it could easily slip into your manuscript or report and confuse readers.